Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e24ff09e3d1b0c9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 19:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52f3be0a11ad44c5ca68524a7ece2a2f SHA-1: 2b087ed8a898d7bb7ca11493e2637d57571485c6 SHA-256: 8e24ff09e3d1b0c91ec552d398433d30f1f38832275df215e8a9573ed73c3bb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=is+fortnite+free+on+ps4+pro PDF link annotation
    • https://groupburuemas2.com/contents/files/33230850380.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced50bc1cd---69333178598.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/gisebetona.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/fepabizorom.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a59905c70c5e22930868ad5257c9a2d6/3820484634.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/44985156240.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/36283040682.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/46139470831.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c6cf6dea9018e40a3aa97be8468b6814/siwomevavimadev.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/87382945264.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/7217795064.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2gfjq099h5v1lelemo6t2g9tc8/88825258319.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/jusuj.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/76021360218.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/jewimuxiravabejejok.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ruweketos.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/80024684211.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/13629958064.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/51975396360.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/42147618654.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2bf48fbbaff2152b8683d9912d046f18/rigonutesitedur.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/lomelexeseropam.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/84577000416.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/10218953130.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 10172 bytes
SHA-256: 5a4d147480cceee7c656dbc73e30949378404c40931e454320b75524089c7c6a
font_02_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 17348 bytes
SHA-256: 14dcf547445576ab3b23367fab1eca7d140b58743511a8c382cc171555263445